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L Series Compressed Air Dryers
About the L Series Desiccant Air Dryer
Size L Series Compressed Air Dryers
L Series Design Advantages
L Series Desiccant Air Dryers Operation Overview
L Series Dryer Dimensions
L Series Engineering Data
L Series Low Flow Compressed Air Dryer Brochure (PDF Format)
L Series Spare Parts List
L Series Pricing & More Information
Model LHW-5 Dryer Pricing & Info. (FLOW 1 to 5 SCFM)
Model LHW-10 Dryer Pricing & Info. (FLOW 6 to 10 SCFM)
Model LHW-15 Dryer Pricing & Info. (FLOW 11 to 15 SCFM)
Model LHW-20 Dryer Pricing & Info. (FLOW 16 to 20 SCFM)
Model LHW-25 Dryer Pricing & Info. (FLOW 20 to 25 SCFM)
In addition to low flow L Series compressed air dryers, eCompressedair can provide assistance for desiccant air dryer needs up to 10,000 SCFM for standand and specialty applications. Complete this form for more information or call us at 704-846-2004.
The L Series heatless desiccant air dryer will protect your process and pneumatically operated equipment from the potentially harmful effects of moisture that is present in typical compressed air systems. L Series Compressed Air Dryers will produce pressure dew points of -40°F (-40°C) or -100°F (-73°C) thereby protecting air systems that are exposed to below freezing temperatures.
L Series Compressed Air Dryers incorporate a time proven design, with superior features and reliability, in a compact and easy to install package. Standard features include:
Simple Heatless Design
- Non-lubricated, soft seated control valves provide maximum reliability and reduced maintenance.
- Engineered desiccant towers minimize purge air consumption and increase desiccant bed life.
- Heavy duty purge exhaust muffler for quiet operation.
Reliable Solid State Timer
- Standard 10 minute cycle increases desiccant and switching valve life over units operating on shorter cycles
- Fully repressurizes the regenerating tower before going on-stream to prevent bed movement and loss of pressure downstream.
- Field adjustable for 4 minute cycle if -100°F (-73°C) pressure dew point is required.
Integral Support Screens and Air Diffusers (top and bottom of vessels)
- Stainless steel construction for long, corrosion free life
- Easily removed to perform maintenance
- Prevents desiccant channeling resulting in extended bed life
Easy to Read Control Panel
- Power on light
- On-off switch
- Tower pressure gauges
Pre and After Filter Kit
- Model ECA-35SU1-G8 coalescing prefilter with integral drain valve protects the desiccant bed against contamination from liquid water or lubricant.
- Model ECA-35AF1-G8 particulate afterfilter, rated at 1 micron, removes desiccant dust fines to protect downstream components
- Pre-engineered piping kit for ease of field mounting
Moisture Indicator Kit Includes...
- Moisture indicator to provide visual verification of desiccant air dryer performance
- Piping kit for ease of field installation
Sheetmetal Wall Mounted Enclosure
- All compressed air dryer components are completely assembled, piped, and wired. (All filters and moisture indicators are field installed.)
- All models include a 6 ft. (1.8 m) cord set.
Size a L Series Compressed Air Dryer
L Series Pricing & More Information
Model LHW-5 Dryer Pricing & Info. (FLOW 1 to 5 SCFM)
Model LHW-10 Dryer Pricing & Info. (FLOW 6 to 10 SCFM)
Model LHW-15 Dryer Pricing & Info. (FLOW 11 to 15 SCFM)
Model LHW-20 Dryer Pricing & Info. (FLOW 16 to 20 SCFM)
Model LHW-25 Dryer Pricing & Info. (FLOW 21 to 25 SCFM)
In addition to low flow L Series desiccant air dryers, eCompressedair can provide assistance for desiccant air dryer needs up to 10,000 SCFM for standand and specialty applications. Complete this form for more information or call us toll-free 704-846-2004.
Operation
Compressed air enters the compressed air dryer and is directed to Tower 1 by valve (A) and then to the compressed air dryer outlet through shuttle valve (B). A portion of the dried air is throttled to near atmosheric pressure by means of orifice (C). This extremely dry, low pressure air flows through and regenerates the desiccant in Tower 2 and is exhausted through purge/repressurization valve (D) and exhaust muffler (E) to atmoshere.
After a set time, the automatic solid state timer closes purge/repressurization valve (D) allowing Tower 2 to repressurize slowly.
At the end of 5 minutes (when operating on a 10 minute cycle, 2 minutes on a 4 minute cycle), valve (A) shifts and purge/repressurization valve (D) re-opens.
See Figure 2. The main air flow is now dried by Tower 2 while Tower 1 is being regenerated.
Dimensions, Connections and Weight
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Model
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Height
in. [mm]
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Width
in. [mm]
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Depth
in. [mm]
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In/Out
Connections
NPT or BSP
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Weight
lb [kg]
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LHW-5
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31 ½ [775]
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31 [787]
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6 11/16 [170]
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½''
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97 [44]
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LHW-10
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31 ½ [775]
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31 [787]
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6 11/16 [170]
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½''
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134 [61]
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LHW-15
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31 ½ [775]
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31 [787]
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6 11/16 [170]
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½''
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151 [68]
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LHW-20
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31 ½ [775]
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37 [940]
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8 9/16 [217]
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½''
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186 [85]
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LHW-25
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31 ½ [775]
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37 [940]
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8 9/16 [217]
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½''
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211 [96]
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Engineering Data
- Flow Capacities
- Maximum inlet flow capacities at various pressures: To determine maximum inlet flow at inlet pressures other than 100 PSIG (7 BAR), multiply inlet flow from Table 1 by multiplier A from Table 2 that corresponds to system pressure at inlet of compressed air dryer.
- Purge flow at various capacities: To determine purge flow at inlet pressures other than 100 psig (7 BAR), from Table 1 by multiplier B from Table 2 that corresponds to system pressure at inlet of compressed air dryer.
- Outlet Flow Capacities: To determine outlet flow capacity, subtract purge flow from inlet flow.
- Operating Conditions
- Electrical:
Power: Choice of 120/110 VAC 1 ph 60/50 Hz, 240/220 VAC 1ph 60/50 Hz, 12 VDC
Enclosure: NEMA 1, IP 23 standard; others available
- Minimum working pressure: 50 PSIG (3.4 BAR)
- Maximum working pressure: 150 PSIG (10.3 BAR)
- Pressure drop: under 3 PSI (0.21 BAR)
- Maximum inlet air or ambient temperature: 120°F (49°C)
TABLE 1 Inlet and Purge Flows @ 100 PSIG (7 BAR)
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Model
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Cycle Time
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Inlet Flow
SCFM [m3/min]
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Average Purge Flow
SCFM [m3/min]
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Maximum Purge Flow
SCFM [m3/min]
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LHW-5
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10
Minute
-40°F
(-40°C)
PDP
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5 [0.14]
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1 [0.03]
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1.1 [0.03]
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LHW-10
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10 [0.29]
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2 [0.06]
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2.2 [0.06]
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LHW-15
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15 [0.43]
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3 [0.09]
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3.3 [0.09]
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LHW-20
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20 [0.57]
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4 [0.11]
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4.4 [0.13]
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LHW-25
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25 [0.72]
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5 [0.14]
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5.5 [0.16]
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LHW-5
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4
Minute
-100°F
(-73°C)
PDP
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4.3 [0.12]
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0.8 [0.02]
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1.1 [0.03]
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LHW-10
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8.5 [0.24]
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1.7 [0.05]
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2.2 [0.06]
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LHW-15
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13 [0.37]
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2.6 [0.07]
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3.3 [0.09]
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LHW-20
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17 [0.49]
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3.4 [0.10]
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4.4 [0.13]
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LHW-25
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21 [0.60]
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4.4 [0.13]
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5.5 [0.16]
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- Inlet flows are established in accordance with CAGI (Compressed Air and Gas Institute) standard ADF-200, Dual Stage Regenerative Desiccant Compressed Air Dryers - Methods for Testing and Rating. Conditions for rating desiccant air dryers are: inlet pressure - 100 PSIG (7 BAR); inlet temperature saturated at 100°F (38°C).
- Average Purge Flow is the total amount of air used to purge and repressurize off-stream towers averaged over the cycle time.
Maximum Purge Flow is the flow rate through the off-stream tower during that portion of the cycle the purge/repressurization valve is open.
TABLE 2 Correction Factors
Inlet Pressure
PSIG [BAR]
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50 [3.5]
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70 [4.9]
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90 [6.3]
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100 [7.0]
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110 [7.7]
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120 [8.4]
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130 [9.1]
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150 [10.5]
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Multiplier A
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0.31
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0.54
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0.83
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1.00
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1.09
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1.17
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1.26
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1.44
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Multiplier B
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0.55
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0.73
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0.91
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1.00
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1.09
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1.17
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1.26
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1.44
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